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<br />Flood of 29 May - 2 June 1894. Heavy rains fell over the mountains extending from <br />the Colorado-Wyoming border southward into the Republican and Arkansas River basins. <br />Rainfall over the Boulder and South BOulder Creek basins was particularly heavy. Rainfall <br />records for a 96-hour period ending at 3:00 a.m. on 2 June 1894 indicate that the <br />mountain drainage area received from 4.5 to 6.0 inches of precipitation, -Rainfall amounts <br />over the high plains gradually decreased from west to east and varied from 5 inches at <br />Boulder to approximately 2.5 inches at the mouth. The mountain rainfall combined with <br />the snowmelt runoff to produce the greatest flood known at Boulder, which came roaring <br />down the valley during the night of 30 May 1894. Buildings, bridges and even long <br />sections of roads and railroads were washed away, Damage was exceptionally heavy <br />along Fourmile Creel( and in Boulder. Computations made 18 years later by Metcalf and <br />Eddy produced estimates of the peak discharge in Boulder that ranged from 9,000 cubic <br />feet per second to 13,600 cubic feet per second, <br /> <br />Flood of 1-2 JunE! 1914. This flood was caused by rainfall on 1 June of more than 1 <br />inch on North Boulder Creek near Silver Lake at an elevation of 10,200 feet. The flood, <br />described as the worst since 1894, washed out numerous bridges between Colbum Mill <br />and Boulder Falls. Several hundred feet of main line for Boulde~s water system were <br />destroyed. The peak: discharge in Boulder was estimated at 5,000 cubic feet per second. <br /> <br />Flood of 2-7 June 1921. Little is known of this flood except that it prOduced the highest <br />peak discharge ever recorded at the Oradell gage. A discharge of 2,500 c.f.s, was <br />recorded on 6 June. Rainfall totaled 3.36 inches at Boulder through a periOd of 2-7 June. <br /> <br />Flood of 3-10 June 1923. This storm centered over the high plains east of the <br />mountains. Rainfall elt Boulder totaled 3.84 inches through a period of 3-10 June with 2.39 <br />inches of the total precipitation falling on 9 June. Combined flows from Boulder, South <br />Boulder, and Bear Canyon Creeks produced flooding downstream of Valmont. <br /> <br />Flood of 4 September 1938. A large storm produced general rains over all of Eastern <br />Colorado. The largest amounts of precipitation occurred in the mountains where over 6 <br />inches was reported west of Eldorado Springs. Boulder reported 3.62 inches of <br />precipitation from 31 August to 4 September with 2.32 inches falling on 2 September. <br />Eldorado Springs, located in the South Boulder Creek basin, had 4.42 inches of rainfall. <br />Approximately 80 percent of the total precipitation falling in the South Boulder Creek basin <br />fell in the late afternoon and evening of 2 September. The resulting flood on South <br />Boulder Creek had an estimated peak discharge of 7,390 c.f,s. at the Eldorado Springs <br />gaging station, The peak gradually SUbsided as the flood moved downstream. maximum <br />discharge of 4,410 c.f.s, occurred near the mouth of Boulder Creek at noon on 3 <br />September. Several buildings in Eldorado Springs were destroyed as a result of erosion <br />around their foundations. Numerous bridges were destroyed and the South Boulder Creek <br />valley from Eldorado Springs to Boulder Creek and down Boulder Creek to the 51. Vrain <br />Creek was described by local newspapers as being in shambles, This flood is the highest <br />recorded flood on thE! South Boulder Creek, <br /> <br />Flood of 6-8 May 1969, This flood was also the result of long duration rainfall. <br />Precipitation was heaviest in the mountains, part of which fell as snow. In the Boulder and <br /> <br />Colorado Flood <br />Hydrology Ma~lual <br /> <br />4,14 <br /> <br />ffi4FT <br />